9878981 has 4 divisors (see below), whose sum is σ = 11290272. Its totient is φ = 8467692.

The previous prime is 9878929. The next prime is 9879007. The reversal of 9878981 is 1898789.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1898789 = 211 ⋅8999.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9878981 is a prime.

It is a super-2 number, since 2×9878981² = 195188531196722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9878381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705635 + ... + 705648.

It is an arithmetic number, because the mean of its divisors is an integer number (2822568).

Almost surely, 2^9878981 is an apocalyptic number.

It is an amenable number.

9878981 is a deficient number, since it is larger than the sum of its proper divisors (1411291).

9878981 is a wasteful number, since it uses less digits than its factorization.

9878981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411290.

The product of its digits is 290304, while the sum is 50.

The square root of 9878981 is about 3143.0846313773. The cubic root of 9878981 is about 214.5708475805.

The spelling of 9878981 in words is "nine million, eight hundred seventy-eight thousand, nine hundred eighty-one".